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diff --git a/public/bluebey-studio/src/hats.js b/public/bluebey-studio/src/hats.js
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-import * as THREE from 'three';
-
-/**
- * Hats for ぶるべー. Each hat is a small group of primitives whose base sits at
- * y = 0, so the app can drop it straight onto the top of the head (see
- * `hatMount` in src/main.js). The character's front is +z, so a brim or a badge
- * faces +z.
- *
- * These are deliberately not textured: like the props, they are built from a few
- * rounded primitives so they take a clean outline and read in every render style.
- */
-
-const material = (color, opts = {}) => new THREE.MeshStandardMaterial({
-  color,
-  roughness: 0.72,
-  metalness: 0,
-  ...opts,
-});
-
-function add(parent, geometry, mat, x = 0, y = 0, z = 0) {
-  const mesh = new THREE.Mesh(geometry, mat);
-  mesh.position.set(x, y, z);
-  mesh.castShadow = true;
-  mesh.receiveShadow = false;
-  parent.add(mesh);
-  return mesh;
-}
-
-const cylinder = (rt, rb, h, seg = 24) => new THREE.CylinderGeometry(rt, rb, h, seg);
-const sphere = (r, w = 24, h = 16, phiStart = 0, phiLength = Math.PI * 2, thetaStart = 0, thetaLength = Math.PI) => (
-  new THREE.SphereGeometry(r, w, h, phiStart, phiLength, thetaStart, thetaLength)
-);
-const box = (w, h, d) => new THREE.BoxGeometry(w, h, d);
-
-/**
- * The 線画 fill a part takes, as how far it steps from the paper towards the ink
- * (see `addMesh` in src/styles.js). Every hat part already gets the light default
- * tone, but two parts of the *same* hat then come out the same shade - so a part
- * that sits flush on another (a band on a crown) loses its seam. Tagging it with
- * a darker tone puts that seam back, without touching リアル / フラット, where the
- * part's own colour already draws it.
- */
-function tone(mesh, strength) {
-  mesh.userData.tone = strength;
-  return mesh;
-}
-
-/** シルクハット: a tall black crown, a narrow band and a flat brim. */
-function buildSilk() {
-  const group = new THREE.Group();
-  const black = material('#1b1722');
-  const band = material('#3a2f4a');
-  add(group, cylinder(1.52, 1.52, 0.12, 32), black, 0, 0.06, 0);
-  add(group, cylinder(1.00, 1.04, 1.62, 32), black, 0, 0.93, 0);
-  tone(add(group, cylinder(1.05, 1.05, 0.24, 32), band, 0, 0.30, 0), 0.34);
-  return group;
-}
-
-/** キャップ: a baseball cap - a low dome, a rim and a bill at the front. */
-function buildCap() {
-  const group = new THREE.Group();
-  const blue = material('#3f6fd0');
-  const dark = material('#2f54a4');
-  // The crown: a hemisphere whose flat face sits on y = 0.
-  const crown = add(group, sphere(1.08, 28, 18, 0, Math.PI * 2, 0, Math.PI / 2), blue, 0, 0, 0);
-  crown.scale.set(1, 0.92, 1);
-  tone(add(group, cylinder(1.10, 1.10, 0.18, 28), dark, 0, 0.09, 0), 0.30);
-  // The bill, tipped down a little at the front.
-  const bill = tone(add(group, cylinder(0.86, 0.86, 0.09, 24), dark, 0, 0.06, 0.92), 0.30);
-  bill.scale.set(1, 1, 1.25);
-  bill.rotation.x = -0.12;
-  tone(add(group, sphere(0.13, 12, 10), dark, 0, 1.02, 0), 0.30);
-  return group;
-}
-
-/** コック帽: a tall pleated toque - a cylindrical band under a big puffy crown. */
-function buildChef() {
-  const group = new THREE.Group();
-  const white = material('#f7f6f2');
-  const shade = material('#e6e3da');
-  // The band: a tall cylinder that sits on the head.
-  add(group, cylinder(0.86, 0.92, 0.95, 28), white, 0, 0.475, 0);
-  tone(add(group, cylinder(0.90, 0.90, 0.10, 28), shade, 0, 0.90, 0), 0.26);
-  // The crown: a big squashed sphere ringed with lobes, so the top reads as the
-  // classic pleated toque rather than a plain dome.
-  const puff = add(group, sphere(1.24, 26, 20), white, 0, 1.30, 0);
-  puff.scale.set(1, 0.82, 1);
-  for (let i = 0; i < 8; i += 1) {
-    const a = (i / 8) * Math.PI * 2;
-    const lobe = add(group, sphere(0.5, 14, 12), white, Math.cos(a) * 0.92, 1.52, Math.sin(a) * 0.92);
-    lobe.scale.set(1, 0.9, 1);
-  }
-  const top = add(group, sphere(0.62, 16, 12), white, 0, 1.92, 0);
-  top.scale.set(1, 0.78, 1);
-  return group;
-}
-
-/** 消防士の帽子: a red helmet with a brim, a top ridge and a small front badge. */
-function buildFire() {
-  const group = new THREE.Group();
-  const red = material('#c5342f');
-  const dark = material('#8f241f');
-  const gold = material('#f0c24a', { metalness: 0.4, roughness: 0.4 });
-  const dome = add(group, sphere(1.06, 28, 18, 0, Math.PI * 2, 0, Math.PI / 2), red, 0, 0, 0);
-  dome.scale.set(1, 0.95, 1);
-  const brim = tone(add(group, cylinder(1.34, 1.34, 0.12, 28), dark, 0, 0.06, 0.18), 0.28);
-  brim.scale.set(1, 1, 1.1);
-  // The ridge along the top, front to back.
-  const crest = tone(add(group, box(0.16, 0.42, 1.5), dark, 0, 1.02, 0), 0.28);
-  crest.rotation.x = -0.05;
-  tone(add(group, sphere(0.2, 14, 12), gold, 0, 0.62, 1.02), 0.22);
-  return group;
-}
-
-const BUILDERS = {
-  silk: buildSilk,
-  cap: buildCap,
-  chef: buildChef,
-  fire: buildFire,
-};
-
-/** The hats offered in the panel: `none` clears it. */
-export const HAT_LIBRARY = [
-  { id: 'none', label: 'なし' },
-  { id: 'silk', label: 'シルクハット' },
-  { id: 'cap', label: 'キャップ' },
-  { id: 'chef', label: 'コック帽' },
-  { id: 'fire', label: '消防士' },
-];
-
-/** Builds the named hat, or `null` for `none` / an unknown name. */
-export function buildHat(id) {
-  const builder = BUILDERS[id];
-  return builder ? builder() : null;
-}